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Production of superabsorbents from fungal chitosan
University of Borås, School of Engineering. (Biotechnology)ORCID iD: 0000-0003-4887-2433
2012 (English)In: Iranian polymer journal, ISSN 1026-1265, E-ISSN 1735-5265, Vol. 21, no 12, p. 845-853Article in journal (Refereed) Published
Sustainable development
The content falls within the scope of Sustainable Development
Abstract [en]

Superabsorbent polymers (SAPs) were prepared from fungal chitosan through three steps of carboxymethylation, cross-linking, and freeze drying. The alkali-insoluble material (AIM) of the cell wall of zygomycetes fungus Rhizomucor pusillus was first pretreated with 72 mM sulfuric acid at room temperature to release the phosphates from the cell wall. The phosphate-free AIM was then either subjected directly to carboxymethylation, or treated with 72 mM sulfuric acid at 120 C to extract and recover the fungal chitosan prior to carboxymethylation. The carboxymethylated derivative of pretreated AIM (CM-P-AIM) and carboxymethyl fungal chitosan (CM-f-CS) exhibited 50 and 100 % water solubility, respectively. Glutaraldehyde was subsequently added to aqueous mixtures of CM-f-CS and CM-P-AIM to cross-link the water-soluble fractions. These mixtures were then frozen at -20 C and freeze dried. The water-binding capacity (WBC) of the final product obtained from CM-f-CS (30% of AIM) was 77, 30, 33 and 45 g/g after 10 min of immersion in water, urine, 0.9 % NaCl and artificial blood solutions, respectively. The respective WBCs of the product obtained from CM-P-AIM (90 % of AIM) were 73, 22, 24 and 37 g/g at identical conditions. SEM micrographs indicated that the SAPs prepared from CM-f-CS and CM-P-AIM had porous sheet-like structures.

Place, publisher, year, edition, pages
Springer , 2012. Vol. 21, no 12, p. 845-853
Keywords [en]
Resource Recovery
National Category
Industrial Biotechnology
Research subject
Resource Recovery
Identifiers
URN: urn:nbn:se:hb:diva-1330DOI: 10.1007/s13726-012-0092-4ISI: 000310625400004Local ID: 2320/11491OAI: oai:DiVA.org:hb-1330DiVA, id: diva2:869354
Available from: 2015-11-13 Created: 2015-11-13 Last updated: 2017-12-01Bibliographically approved

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Taherzadeh, Mohammad J.

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